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<title>Problem 1284. -- Neerc2006Driving Directions -- 衡阳八中OJ离线版-2012-02-29</title><center><h2>1284: Neerc2006Driving Directions</h2><span class=green>Time Limit: </span>10 Sec&nbsp;&nbsp;<span class=green>Memory Limit: </span>162 MB<br><span class=green>Submit: </span>3&nbsp;&nbsp;<span class=green>Solved: </span>0<br>[<a href='submitpage.php?id=1284'>Submit</a>][<a href='problemstatus.php?id=1284'>Status</a>][<a href='bbs.php?id=1284'>Discuss</a>]</center><h2>Description</h2><div class=content>在平面上有n个平行于坐标轴的矩形障碍物, 现需要将一个半径为r的圆从A点移动到B点. 请计算最短路. (n <= 30)
<img border="0" src="images/1284.jpg"></div><h2>Input</h2><div class=content>本题是多组数据，第一行一个整数T(T<=30)表示数据组数，接下来依次描述每一组数据，每组数据第一行两个整数r,n(1<=r<=100,0<=n<=30)如上所述。第二行包含4个整数xA,yA,xB,yB，(xA,yA)表示起点A坐标，(xB,yB)表示终点B坐标。接下来n行每行4个整数x1,y1,x2,y2，(x1,y1)表示矩形障碍物左下角坐标，(x2,y2)表示矩形障碍物右上角坐标。
矩形不会互相覆盖或接触，起点的坐标是合法的，即一开始不会与任何矩形相交（但是可能和某些矩形相切）

</div><h2>Output</h2><div class=content>每组数据输出一行，一个实数，输出保留6位小数，即从A到B不穿过矩形的最短路，如果不存在最短路请输出no solution。

</div><h2>Sample Input</h2>
			<div class=content><span class=sampledata>1<br />
1 3<br />
2 7 7 1<br />
3 2 6 4<br />
7 5 9 8<br />
1 8 5 9<br />
<br />
</span></div><h2>Sample Output</h2>
			<div class=content><span class=sampledata>10.570796<br />
</span></div><h2>HINT</h2>
			<div class=content><p></p></div><h2>Source</h2>
			<div class=content><p><a href='problemset.html?search=Neerc'>Neerc</a></p></div><center>[<a href='submitpage.php?id=1284'>Submit</a>][<a href='problemstatus.php?id=1284'>Status</a>][<a href='bbs.php?id=1284'>Discuss</a>]</center>﻿<br>

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